Previous Front Pages

2010

ONR's BASSEX program is studying the acoustic shadows cast by seamounts. The example above shows the bathymetry, along with measured TL for a recent test near the Kermit-Roosevelt seamount in the North Pacific. The strong shadowing effects are clearly visible. Three-dimensional acoustic models (lower panels) are being validated using a benchmark problem with a conical seamount.

2008
 

Click on the above figure to complete the Ocean Acoustics crossword puzzle or click here to download a PDF of same. Happy Holidays!.

2007

The wireless internet extends to the sea .... ONR's research in high-frequency acoustic propagation and acoustic communications is providing the underlying science that will enable flexible undersea networking. A prototype system shown above has been developed in the navy's SeaWEB program. The network is being used for real-time oceanographic observations in the FRONT program.

2006 

Possible applications of time-reversal acoustics are being studied by several groups. A transmitted signal is received on the vertical array on the right as a complicated waveform. However, when that received waveform is back-propagated, a focused signal is received back at the source.